Abstract
Phonon-induced contributions arising from the one-phonon second-order mechanism to the second-order coupling coefficients K Γ (2) ( Γ = E g, T 2g) for Gd 3+ in crystals with the fluorite structure are estimated. It was found that the contributions resulting from the second-order mechanism do not exceed 10 4 cm −1 and are much smaller than the K Γ (2) coefficients determined experimentally as well as the contributions resulting from the first-order mechanism.
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